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FatAgnus
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Text File
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1989-10-01
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2KB
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53 lines
Here is the instruction page that is sent to dealers with the new Fatter
Agnus chips.
-------- installation procedure starts here --------
8372 FATTER AGNUS INSTALLATION PROCEDURES
The new 8372 FATTER AGNUS IC, (P/N 318069-02), will require the following
modifications for proper operation. If no modifications are performed the
IC will address only 512K of Chip RAM and operate only in the NTSC Mode.
NOTE: The correct IC Extractor Tool must be used when removing the
original 8370 FAT AGNUS from the socket. The Extractor Tool is
available from Commodore Parts. P/N 314874-01
INSTALLING FATTER AGNUS IN THE AMIGA 2000
1) Locate Jumper J101 (Lower Right of Power Connector CN400 and move the
installed shorting block to the left, shorting pins 2 and 3.
* This will enable Address 19 from the 68000.
* See Page 13 of A2000 System Schematics
2) Locate Jumper Pad J500 (Lower left of 8520 IC at U301) and use a
sharp Exacto knife to cut the trace connecting the two (2) pads.
* This controls the _EXRAM signal.
* See Page 9 of A2000 System Schematics
3) Line Pin 1 of the 8372 FATTER AGNUS with Pin 1 of the socket and
insert IC.
INSTALLING FATTER AGNUS IN THE AMIGA 500
1) Locate Jumper pad JP2 (Between 68000 at U1 and ROM at U6) and use a
sharp Exacto Knife to cut the trace connecting the Bottom and Center
Pads. Solder the Top and Center Pads.
* This will enable Address 19 from the 68000
* See page 39 of A500 Service Manual
2) Locate the RAM Expansion Bus Connector CNX. Pins 1 and 2 are on the
bottom row and pins 55 adn 56 on the top row. Count up from the
bottom, (by 2's) and locate pins 41 and 42. About 1/8" to the left
is a plated hole with a trace which runs straight up, (parallel with
the white silkscreen line designating the CNX connector outline.)
This trace should connect between to pin 32 of CNX and pin 32 of the
GARY IC U5. This trace must be cut.
* This controls the _EXRAM signal.
* See pages 39 and 40 of A500 service manual
NOTE: There is also another trace running straight up next
to the trace which must be cut. This trace may be
obscured by teh silkscreen line.
BE VERY CAREFUL THIS TRACE IS NOT CUT
3) Line Pin 1 of the 8372 FATTER AGNUS with Pin 1 of the Socket and
insert the IC.
-------- installation procedure ends here --------